[FEATURE]Enhancement of Language Drop-Down Menu CSS in the Header Section

**Is your feature request related to a problem? Please describe.**
The current CSS for the language drop-down menu in the navbar doesn't align well with the header font and design. It could use some enhancements to provide a more seamless and visually appealing user experience.

**Describe the solution you'd like**
- Adjust the font size and style to match the header font.
- Ensure the color scheme is consistent with the overall design.
- Add a subtle transition effect for smoother user interactions.

**Describe alternatives you've considered**
-- NIL --

**Additional context(Screenshot added)**

**I'd be happy to take on adding this feature!**